[gradsusr] Visualize Wind Vectors

[Arlindo da Silva]

2010/10/20 Nena Carina Española <nena at asti.dost.gov.ph>

>  Hi Daniele,
>
> Thanks for the help.
>
> I am still figuring out how to convert my station data into GrADS binary as
> I am very new to GrADS. I already posted my problem yesterday but nobody has
> answered it yet.
> http://gradsusr.org/pipermail/gradsusr/2010-October/011667.html
>
> I do not know how to create a binary with more than one surface variable. I
> was able to create a binary for one variable only and most examples I find
> use only one variable. Now I have three, and data is hourly. Here's a
> sample:
>

Have you seen this Recipe?


http://cookbooks.opengrads.org/index.php?title=Recipe-005:_Creating_GrADS_binary_station_data_from_ASCII


       Arlindo



> YEAR    MO    DA    HO    STNID    LATITUDE     LONGITUDE     PRESSURE
> DIR    SPEED
> 2010    09    08    08    98132    20.800283    121.847534    1012.3
> 160    12
> 2010    09    08    08    98133    19.283147    121.463012    1008.5
> 120    8
> 2010    09    08    08    98134    20.454293    121.963806    1009.2
> 140    12
> 2010    09    08    08    98222    17.582765    120.387268    1008.1
> 220    4
> 2010    09    08    08    98223    18.185845    120.58239     1006.6
> 250    10
> 2010    09    08    08    98232    18.360782    121.658935    1009.5
> 90     4
> 2010    09    08    08    98233    17.629364    121.70288     1008.1
> 0      0
> 2010    09    08    08    98324    15.328294    119.980087    1007.2
> 270    2
> 2010    09    08    08    98325    16.051192    120.333195    1007.3
> 360    4
> 2010    09    08    08    98327    16.607768    121.265259    1007.5
> 190    4
>
> Thanks again. :-)
>
>
>
> On Friday, 15 October, 2010 05:52 PM, Daniele Gandini wrote:
>
> Hi Nena.
>
> Here a simple formula to have U and V in m/s from wind speed (velv) and direction (dirv):
>
>  'set gxout barb'
>  'd -velv*cos((dirv-90)/180*3.14);-velv*cos(dirv/180*3.14)'
>
> To display these data with OACRES function first you must create a base grid file
> with a "dummy" constant value for example and then you can interpolate wind data:
>
>   'vel=oacres(dummy.1,velv.2,4,3,3,1)'
>   'd vel'
>   'run cbarn.gs'
>
> Good luck.
>
>




> Daniele
>
> ----- Messaggio originale -----
> Da: "Nena Carina Española" <nena at asti.dost.gov.ph> <nena at asti.dost.gov.ph>
> A: "GrADS Users Forum" <gradsusr at gradsusr.org> <gradsusr at gradsusr.org>
> Inviato: Venerdì, 15 ottobre 2010 5:32:26
> Oggetto: [gradsusr] Visualize Wind Vectors
>
>
> Hello Guys!
>
> I am trying to create a visualization of the wind vectors. I am not sure where to begin as my data is not split into U and V components. Here's a snippet of the sample data I have. These are from 24 weather stations in the Philippines. Can I also interpolate these scattered data to create a gridded data using the OACRES function?
>
>
>
> 	Station ID 	Latitude 	Longitude 	Wind Speed (m/s) 	Wind Direction (degrees)
> 	12 	15.721279 	121.522293 	0.8 	204
> 	70 	7.135233 	124.814758 	2.21 	148
> 	72 	6.960916 	126.212082 	6.34 	286
> 	73 	9.282162 	123.244572 	9.6 	20
> 	74 	8.997093 	124.883595 	1.54 	85
> 	75 	9.217067 	124.713134 	3.84 	89
> Thanks,
>
> Nena
>
>
>
>
> --
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> Email: nena at asti.dost.gov.ph
>
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>


-- 
Arlindo da Silva
dasilva at alum.mit.edu
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